add Bengali Transliteration

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/BengaliLanguageUtils.java

@@ -0,0 +1,110 @@
+package nodomain.freeyourgadget.gadgetbridge.util;
+
+import java.util.HashMap;
+
+public class BengaliLanguageUtils extends LanguageUtils {
+
+    private final static char BENGALI_JOIN_CHAR = '্';
+
+    private final static HashMap<Character, String> numbers = new HashMap<Character, String>() {
+        {
+            put('০',"0"); put('১',"1"); put('২',"2"); put('৩',"3"); put('৪',"4");
+            put('৫',"5"); put('৬',"6"); put('৭',"7"); put('৮',"8");
+            put('৯',"9");
+        }
+    };
+
+    private final static HashMap<Character, String> vowels = new HashMap<Character, String>() {
+        {
+            put('অ', "o"); put('আ', "a"); put('ই', "i"); put('ঈ', "ee");
+            put('উ', "u"); put('ঊ', "oo"); put('ঋ', "ri"); put('এ', "e");
+            put('ঐ', "oi"); put('ও', "o"); put('ঔ', "ou"); put('া', "a");
+            put('ি', "i"); put('ী', "ee"); put('ু', "u"); put('ূ', "oo");
+            put('ৃ', "ri"); put('ে', "e"); put('ৈ', "oi"); put('ো', "o");
+            put('ৌ', "ou");
+        }
+    };
+
+    private final static HashMap<Character, String> consonants = new HashMap<Character, String>() {
+        {
+            put('ঁ', ""); put('ং', "ng"); put('ঃ', "");
+            put('ক', "k"); put('খ', "kh"); put('গ', "g"); put('ঘ', "gh"); put('ঙ', "ng");
+            put('চ', "ch"); put('ছ', "ch"); put('জ', "j"); put('ঝ', "jh"); put('ঞ', "ng");
+            put('ট', "t"); put('ঠ', "th"); put('ড', "d"); put('ঢ', "dh"); put('ণ', "n");
+            put('ত', "t"); put('থ', "th"); put('দ', "d"); put('ধ', "dh"); put('ন', "n");
+            put('প', "p"); put('ফ', "f"); put('ব', "b"); put('ভ', "v"); put('ম', "m");
+            put('য', "z"); put('র', "r"); put('ল', "l"); put('শ', "sh");
+            put('ষ', "sh"); put('স', "s"); put('হ', "h");
+            put('ৎ', "t"); put('ড়', "r"); put('ঢ়', "r"); put('য়', "y");
+        }
+    };
+
+    private final static HashMap<Character, String> symbols = new HashMap<Character, String>() {
+        {
+            put('ব', "w");
+            put('য়', "y");
+        }
+    };
+
+    private final static HashMap<Character, String> joins = new HashMap<Character, String>() {
+        {
+            put('৳', "$");
+        }
+    };
+
+    private static boolean hasJoinedInString(String string) {
+        return string.contains(string);
+    }
+
+    public static String transliterate(String txt) {
+        if (txt.isEmpty()) {
+            return txt;
+        }
+
+        char[] charArray = txt.toCharArray();
+
+        StringBuilder romanizedBuilder = new StringBuilder();
+        char last = '\0';
+
+        for(int i = 0; i < txt.length(); i++) {
+            char currentChar = charArray[i];
+
+            if (symbols.containsKey(currentChar)) {
+                romanizedBuilder.append(symbols.get(currentChar));
+            }
+            else if (numbers.containsKey(currentChar)) {
+                romanizedBuilder.append(numbers.get(currentChar));
+            }
+            else if (vowels.containsKey(currentChar)) {
+                romanizedBuilder.append(vowels.get(currentChar));
+            }
+            else if (consonants.containsKey(currentChar)) {
+                if (last != '\0' && consonants.containsKey(last)) {
+                    romanizedBuilder.append('o');
+                }
+                romanizedBuilder.append(consonants.get(currentChar));
+            } else if (currentChar == BENGALI_JOIN_CHAR) {
+                if (i + 1 < txt.length() && joins.containsKey(charArray[i + 1])) {
+                    romanizedBuilder.append(joins.get(charArray[i + 1]));
+                    i++;
+                    continue;
+                }
+            } else {
+                romanizedBuilder.append(currentChar);
+            }
+
+            last = currentChar;
+        }
+
+        String romanized = romanizedBuilder.toString();
+
+        if (vowels.containsKey(charArray[charArray.length - 1])
+                && hasJoinedInString(txt)
+                && romanized.toCharArray()[romanized.length() - 1] == 'y') {
+            romanizedBuilder.append('o');
+        }
+
+        return romanizedBuilder.toString();
+    }
+
+}

app/src/main/java/nodomain/freeyourgadget/gadgetbridge/util/LanguageUtils.java

@@ -111,7 +111,9 @@ public class LanguageUtils {
             message.append(transliterate(c));
         }
 
-        return flattenToAscii(message.toString());
+        String messageString = BengaliLanguageUtils.transliterate(message.toString());
+
+        return flattenToAscii(messageString);
     }
 
     /**

app/src/test/java/nodomain/freeyourgadget/gadgetbridge/test/LanguageUtilsTest.java

@@ -57,6 +57,15 @@ public class LanguageUtilsTest extends TestBase {
         assertEquals("Farsi transiteration failed", farsiExpected, farsiActual);
     }
 
+    public void testStringTransliterateBengali() throws Exception {
+        //input with cyrillic and diacritic letters
+        String input = "অনিরুদ্ধ";
+        String output = LanguageUtils.transliterate(input);
+        String result = "oniruddho";
+
+        assertEquals("Transliteration failed", result, output);
+    }
+
     @Test
     public void testTransliterateOption() throws Exception {
         setDefaultTransliteration();